Something like this? I assume the arrow should point towards rhumb line?
Yes pretty much, looks cools!,
A refinement: the XTE number and direction is something to check at a glance. In your example, ~1km XTE with 6.5km to go means you should be going left of target to converge, or at least don’t go any more right
Eg below where at a glance you can see you are left of the line, and then look more closely to see how far. Ideally just the 0.25R is all you need to know,
eg below,
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I think you need two things taking up 90% of real estate. Also Fwiw I’ve got an old small faced apple watch, so for this even to be usable needs to use way more screen space than on the ultra.
Time to Go isn’t useful for me, so I’d drop both of those, and just have screen split into
- Distance in decimal km + Arrow
- XTE decimal KM + L/R and arrow on the indicated side
Optional 3rd would be Time to Go @ Average speed, but that is possibly quite misleading
I think the key point being Max Info at a single glance, and I think Distance + XTE is the most info you can get in two metrics
There’s actually already a setting called “Old Guys Rule” on the watch app (tap the cog in the upper left corner). That will hide all the icons (except for the xte) and make the text as big as it can be. I think that would help if you’ve got a smaller Apple Watch. Maybe not the best name for that setting though. 
Cool, looks great!
I tried the distance + arrow feature in the surf, the arrow is small and you need to hold the watch up to eye level to really see the direction, if you just look down it feels like because it as at your side, it’s hard to really gauge the direction you need to go. I would make sure to stop and carefully check direction rather than glancing at it.
Garmin has a feature called “Rhumb line” which I can’t find online but Josh Ku and James Casey talk about it as a useful aid.
Also a side note, stopping a session by having to use the screen is really difficult. I feel like it should be assumed that only the bezel and side buttons are functioning when using the watch.
Old guys - for me on small apple watch (man what a mistake getting the small one) makes the text overlap off the screen
I could increase the size of the arrow a bit but the real estate is a bit limited. I’ll see what I can do.
Cross track error is your distance to rhumb line. Maybe they’re talking about something pretty similar to what I just implemented?
Apperantly I haven’t tested the app enough on the small Apple Watch. My apologies. I’ll go through the app and make sure the large font mode works as expected even on smaller watches.
And stopping a recording while on the water is almost impossible. 
If you have the apple watch ultra you can use the action button to pause the recording and then stop it once up on dry land. I’ve got some ideas on how to solve this but it will take some time to get to it.
Did some last tweaks to the destination view. XTE is now color coded to make it even easier to read. Red if you’re left of rhumb line and green if you’re to the right.
Yes the XTE is roughly the same as rhumb line from Garmin afaik.
Yes I think so, but the smallest apple watches aren’t great anyway.
Just to be clear, below layout is optimal for me, so if that can go in I’d be very grateful
Also just to share some insight, I looked across sailing apple watch apps for this feature, none really got it right like the Garmin (note the speed splits)
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Here is iSailor Watch layout, which is excessive.
It has been a while since sailing so I wonder how important the BTW (Bearing to Waypoint) is in conjunction with the XTE. I think not necessary, but that is something that the arrow might help with
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I would have this app, but I have a garmin watch which I use to avoid oyster beds. Here’s an idea with big text and an arrow underlay to make it easy to read while wet and sunny.
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New version just dropped. The big thing this time is full GPX import and export. You can now switch over to Foil Sessions from pretty much any tracking app that can spit out a GPX file and keep all those nice sessions you’ve recorded. You could also go the other way, although I’m not sure why you’d want to. 
It also opens the door for posting your tracks to online leaderboards. And for all the Garmin folks: you can now pull your sessions into Foil Sessions and actually analyze them in a foiling-focused app. I love my Garmin watch, but their app isn’t exactly built with foilers in mind.
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The latest release of foil sessions adds sharing to instagram, facebook, messages, and more. You can move, resize, and even rotate the track. If you don’t like the default title, you can edit that too.
I’m already working on the next release with weather support and customizable track colors. Turns out the blue I picked doesn’t work on all satellite images. Who knew.
Up/downwind session:
Individual run:
